Bash sometimes cannot find aliases

[Dan Zwell]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-unknown-linux-gnu' 
-DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' 
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -march=x86-64 
-mtune=generic -O2 -pipe
uname output: Linux mordor 2.6.32-ARCH #1 SMP PREEMPT Mon Jan 18 
23:30:46 CET 2010 x86_64 Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz 
GenuineIntel GNU/Linux
Machine Type: x86_64-unknown-linux-gnu

Bash Version: 4.1
Patch Level: 2
Release Status: release

Description:
	When I attempt to run an alias, Bash occasionally says the command is 
not found. Re-running the command generally succeeds. This also occurs 
with aliases that are named after existing programs. For example, 
running "ls", which is aliased to "ls --color", occasionally results in 
"ls" being run without the "--color" argument (the alias is bypassed).

Repeat-By:
	This problem seems to occur once every few hundred aliased commands I 
run. It seems more frequent immediately after sourcing a .bashrc file. I 
cannot reproduce it with a loop that repeatedly runs an aliased command.

Is this a known issue? I may be able to help debug this (perhaps by 
modifying my build to log state when a command is not found).

Thanks
-Dan